Thank you for clerifying.
While Blink is great choice, here are my answers:
Q: What camera can be controlled in the smartthings app?
Samsung HD camera can be directly integrated into ST, however as I already tested it, it SUCKS!
Blink can be integrated into ST via 3rd party integration above.
Q:allow motion to be selected
Blink can detect motion and send notification but mostly after it records a clip. You can still use it as a direct motion sensor, but you will need to set the clip length to 1 second. That defits the purpose of the video recording, but may serv as a motion camera when you are home.
Q: take video only when trigged
Blink takes video clps 60seconds long without @RBoy integration and upto 120 seconds with his code. And is always triggered by motion.
Q: Live view?
Yes, if you use the 3rd party integration in ST, you can access the Blink live view and photo capability.